[He absolutely has taken all of this to be dismemberment via bat withholding. Please note that he's not having an entire crisis about this Geralt.]

Oh, that part's easy. I'd remain bats, and then either the single bat would eventually be pulled back to the cloud of bats or the bats would move over to the missing one. It depends on the levels of bat distress and if one area is safer than the other.

[He shrugs, taking a sip of the wine.]

Also the bats might flop onto the ground right now.